Magnetic actuators for haptic response
In an embodiment, an actuator or circuit includes elements moveably coupled via bearings positioned between curved grooves. The bearings and the curves may exert a restorative force to return the elements to an original position after movement and may be spherical, cubic, cylindrical, and/or include gears that interact with groove gears. In some embodiments, an electrical coil may be coplanar with a surface of an element and a hard magnet may be positioned in the center and be polarized to stabilize or destabilize the element with respect to another element. In various embodiments, a magnetic circuit includes an element with an electrical coil wrapped in multiple directions around the element. In some embodiments, an actuator includes attraction elements and exertion of force causes an element to approach, contact, and/or magnetically attach to one of the attraction elements.
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This application is a continuation of U.S. patent application Ser. No. 15/025,425, filed Mar. 28, 2016, now U.S. Pat. No. 10,236,760, and entitled “Magnetic Actuators for Haptic Response,” which is a 35 U.S.C. § 371 application of PCT/US2013/062556, filed on Sep. 30, 2013, and entitled “Magnetic Actuators for Haptic Response,” the contents of which are incorporated by reference as if fully disclosed herein.
TECHNICAL FIELDThis disclosure relates generally to haptic devices, and more specifically to magnetic actuators that provide a haptic response.
BACKGROUNDMagnetic actuators, such as those utilized in haptic devices, typically include a first body element that is moveable with relation to a second body element. Such movement may be accomplished through direction of magnetic flux utilizing one or more electrical coils, soft magnets (a material that is not permanently magnetic but can become magnetic in response to the proximity of a magnetic force), and/or one or more hard magnets (materials that are permanently magnetic such as rare-earth magnets). The movement may cause vibrations, which may be provided to a user as haptic output or feedback.
SUMMARYThe present disclosure discloses magnetic actuators and circuits. In various embodiments, a magnetic actuator or circuit may include a moveable body or bar element that is moveably coupled to a fixed body or bar element via one or more bearings positioned between one or more grooves. In some cases the grooves may be curved such that force exerted causing lateral movement of the moveable body or bar elements cause the bearings to move upward on the curve of the groove such that the bearing moves back down the curve and restores the moveable body or bar elements to an original position after the force is no longer exerted. In various cases, the bearings may be spherical, cubic, cylindrical, and/or include gear elements that interact with one or more gear elements of the grooves. In some cases, the bearings cause the moveable body or bar element to translate vertically as well as move laterally, though in other cases the bearings may only cause the moveable body or bar elements to move laterally.
In some embodiments, a body element may include one or more electrical coils coplanar with the body element. In various cases, the body element may also include one or more hard magnets positioned in the center of the electrical coil that are polarized to stabilize or destabilize centering of the body element with respect to another body element.
In various embodiments, a magnetic circuit may include a first bar element with a plurality of hard magnets and/or soft magnets and a second bar element with one or more electrical coils wrapped around the second bar element. In some cases, the electrical coil may include a first section wrapped in a first direction, a second section wrapped in a second direction opposing the first direction, and a middle section that transitions between the first direction and the second direction.
In one or more embodiments, an actuator may include a fixed body element, with first and second side soft magnets, that is moveably coupled to a moveable body element. Exertion of force may cause the moveable body element to move such that the moveable body element approaches and/or contacts the first or second soft side magnet. Such contact may result in a “tap,” which may be provided to a user as a tactile output. Upon contact, the moveable body element may magnetically attach to the respective soft side magnet and may remain so after the force is no longer exerted until another force is exerted that detaches the moveable body element and causes it to move to approach the other soft side magnet.
In some embodiments, an actuator may include a first magnetic attraction element, a second magnetic attraction element, and a moveable member including a first hard magnet, a second hard magnet, and an electrical coil. Exertion of force may cause the moveable member to move such that the first hard magnet approaches and/or contacts the first magnetic attraction element or the second hard magnet approaches and/or contacts the second magnetic attraction element. Such contact may result in a “tap,” which may be provided to a user as a tactile output. Upon contact, the respective hard magnet may magnetically attach to the respective magnetic attraction element and may remain so after the force is no longer exerted until another force is exerted that detaches the respective hard magnet and causes the moveable member to move such that the other hard magnet approaches the other magnetic attraction member. In some cases, the magnetic attraction elements may be hard magnets, though in other implementations the magnetic attraction elements may be soft magnets.
It is to be understood that both the foregoing general description and the following detailed description are for purposes of example and explanation and do not necessarily limit the present disclosure. The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate subject matter of the disclosure. Together, the descriptions and the drawings serve to explain the principles of the disclosure.
The description that follows includes sample systems, methods, and computer program products that embody various elements of the present disclosure. However, it should be understood that the described disclosure may be practiced in a variety of forms in addition to those described herein.
In many magnetic actuators, a first body element and a second body element may be connected via one or more centering springs. When the first and second body elements move with respect to each other from an original position, the centering spring may exert a restorative force upon the first and second body elements. This restorative force may operate to bring the first and second body elements back to the original position so that the first and second body elements are positioned for subsequent movement.
The present disclosure discloses magnetic actuators and circuits. In various embodiments, a magnetic actuator or circuit may include a first element that is moveably coupled to a second element via one or more bearings positioned between one or more grooves. In some cases the grooves may be curved. The bearings and the curves may exert a restorative force to return the first and second elements to an original position after movement. In various cases, the bearings may be spherical, cubic, cylindrical, and/or include gear elements that interact with one or more gear elements of the grooves.
In some embodiments, a second element may include one or more electrical coils that are coplanar with a surface of the second element. In various cases, the second element may also include one or more hard magnets positioned in the center of the electrical coil that are polarized to stabilize or destabilize centering of the second element with respect to a first element.
In various embodiments, a magnetic circuit may include a second element with one or more electrical coils wrapped around the second element. In some cases, the electrical coil may include a first section wrapped in a first direction, a second section wrapped in a second direction opposing the first direction, and a middle section that transitions between the first direction and the second direction.
In one or more embodiments, an actuator may include a first element with first and second side soft magnets that is moveably coupled to a second element. Exertion of force may cause the second element to move such that the second body element approaches and/or contacts the first or second soft side magnet. Such contact may result in a “tap,” which may be provided to a user as a tactile output. Upon contact, the second element may magnetically attach to the respective soft side magnet and may remain so after the force is no longer exerted until another force is exerted that detaches the second element and causes it to move to approach the other soft side magnet.
In other embodiments, an actuator may include a first magnetic attraction element, a second magnetic attraction element, and a moveable member including a first hard magnet, a second hard magnet, and an electrical coil. Exertion of force may cause the moveable member to move such that the first hard magnet approaches and/or contacts the first magnetic attraction element or the second hard magnet approaches and/or contacts the second magnetic attraction element. Upon contact, the respective hard magnet may magnetically attach to the respective magnetic attraction element and may remain so after the force is no longer exerted until another force is exerted that detaches the respective hard magnet and causes the moveable member to move such that the other hard magnet approaches the other magnetic attraction member.
Although the magnetic actuator is illustrated and described herein as coupled to the track pad of the electronic device, it is understood that this is an example. In various implementations, the magnetic actuator may be utilized in a variety of different ways in a variety of different electronic devices. For example, such a magnetic actuator may be coupled to a housing (such as the housing of a tablet computer, mouse, and so on), one or more selection elements (such as one or more keys of a keyboard, buttons of a mouse, touch pads of a tablet computing device, and so on), a wearable device such as a watch, glasses, and so on.
As illustrated, the magnetic actuator may include a fixed body element 104, a number of bearings 110 (which may be spherical), and a moveable body element 103. The fixed body element may include an electrical coil 107 (which may be coplanar with a surface of the fixed body element) and a number of first grooves 105. The moveable body element may include a first hard magnet (materials that are permanently magnetic such as rare-earth magnets) 108, a second hard magnet element 109 (see
Application of electrical current to the electrical coil 107 may cause the electrical coil to generate a magnetic field. The magnetic field has a magnetic flux. The magnetic flux may exert a force upon any magnetic material (i.e., the first hard magnet 108 and the second hard magnet 109) within the magnetic field. The vector of the force may vary with the magnetic flux, which may vary according to the position of the magnetic material within the field. This force may cause the moveable body element 103 to move laterally with respect to the fixed body element 104. This movement may cause one or more vibrations, which may be provided to a user as tactile output or feedback. An example of the flow of the magnetic flux 170 can be seen in
Thus, returning to
As such, the bearings 110 and the grooves 105 and 106 may interact to exert a restorative force on the moveable body element after movement. This restorative force may operate to return the moveable body element to an original position with respect to the fixed body element after the lateral movement.
With reference again to
Additionally, although the bearings 110 are illustrated and described above as spherical and the first and second grooves 105 and 106 are shown as curved cross-sectionally to correspond to the bearings, it is understood that this is an example. In various implementations, the bearings may be cylindrical and include a plurality of gear elements that are configured to interact with gear elements defined in the first and second grooves. Such an implementation may prevent slippage between the bearings and the first grooves and the second grooves. Such an implementation is illustrated in
Although the magnetic actuator 100A is illustrated and described above as including four bearings 110, four first grooves 105, and four second grooves 106, it is understood that this is an example. In various implementations, the magnetic actuator may include any number of bearings and/or grooves (such as one, three, or fifteen).
As such, when the moveable body element 103 moves laterally with respect to the fixed body element 104 due to the application of force, the cube bearings may roll along the corresponding curved areas. When the force ceases, gravity and/or other forces may then cause the cube bearings to roll back along the corresponding curved areas. This may provide a restorative force that may operate to return the moveable body element to an original position with respect to the fixed body element after movement.
The relationship between the dimensions of the cube and the dimensions of the curved areas 141, 143, 145, and/or 147 may determine whether or not the cube bearings 140 move the moveable element 103 in a purely lateral direction or whether the cube bearings force the moveable body element to translate vertically as well as laterally.
Although the moveable body element 103 has been illustrated and described above as moveable with respect to the fixed body element 104, it is understood that this is an example. In various implementations, the body element 104 may be moveable with respect to a fixed body element 103.
Returning to
In response to application of an electrical current, the first and second sides of the electrical coil 206 and 207 may generate a magnetic field. The magnetic field has a magnetic flux 209. The magnetic flux may exert a force upon any magnetic material (i.e., the first hard magnet 203 and the second hard magnet 204) within the magnetic field. The vector of the force may vary with the magnetic flux, which may vary according to the position of the magnetic material within the field. This force may cause the second body element 212 to move laterally with respect to the first body element 211. This movement may cause one or more vibrations, which may be provided to a user as tactile output or feedback.
In this first implementation, the center hard magnet 208 may be polarized to oppose the direction of the magnetic flux 209. This opposition may destabilize centering of the first body element 211 with respect to the second body element 212 because the polarities of the sides of the center hard magnet 208 repel the respective polarities of the undersides of the first and second hard magnets 203 and 204. Instead, as a result of the opposition and repulsion, the second body element may be more stable when offset from center in either lateral direction with respect to the first body element than when centered with respect to the first body element. In implementations where the second body element has an original position centered with respect to the first body element, this may cause resistance to the second moveable body element returning to the original centered position with respect to the first moveable body element after the lateral movement 210.
In other implementations, the second body element 212 may have an original position that is offset with respect to the first body element 211 and that may be disrupted by the lateral movement 210 of the second body element. In such implementations, the opposition of the center hard magnet 208 to the direction of the magnetic flux 209 may provide a restorative force after the lateral movement (caused by the repulsion of the sides of the center hard magnet 208 that the respective polarities of the undersides of the first and second hard magnets 203 and 204) that acts to return the second body element to the original offset position with respect to the first body element after the lateral movement of the second body element.
The second body element 212 may be moveably coupled to the first body element 211 utilizing a variety of different mechanisms (not shown). For example, in some implementations the second body element may be suspended from the first body element, such as by wire or string. In other implementations, one or more springs, magnetic forces, and so on may moveably couple the second body element to the first body element.
Although the second body element 212 has been illustrated and described above as moveable with respect to the first body element 211, it is understood that this is an example. In various implementations, the first body element may be moveable with respect to the second body element.
Returning to
Although the fixed body element 301A is illustrated and described as incorporating the top structure 310A, the first side soft magnet 304A, and the second side soft magnet 305A into a single soft magnet 303A, it is understood that this is an example. In other implementations the first side soft magnet, the second side soft magnet, and/or the top structure may be formed of separate soft magnets. Additionally, in various implementations the top structure may not be a soft magnet.
In response to application of an electrical current, the electrical coil 308A may generate a magnetic field. The magnetic field has a magnetic flux. The magnetic flux may exert a force upon any magnetic material (i.e., the first hard magnet 306A and the second hard magnet 307A) within the magnetic field. The vector of the force may vary with the magnetic flux, which may vary according to the position of the magnetic material within the field. This force may cause the moveable body element 302A to approach and/or contact either the first side soft magnet 304A or the second side soft magnet 305A. Such approaches and/or contacts may result in one or more vibrations or taps which may be provided to a user as haptic output or feedback.
When the second moveable body element 302A contacts the first side soft magnet 304A, the second moveable body element may magnetically attach to the first side soft magnet. Subsequently, the second moveable body element may remain magnetically attached to the first side soft magnet even after the electrical current that resulted in the movement of the second moveable body element is no longer applied to the electrical coil 308A. A similar effect may occur when the second moveable body element contacts the second side soft magnet 305A.
The second moveable body element 302A may remain magnetically attached to the first side soft magnet 304A even after the first electrical current is no longer applied to the electrical coil 308A. The second moveable body element may remain magnetically attached to the first side soft magnet until a second electrical current is applied to the electrical coil.
Although the moveable body element 302A has been illustrated and described above as moveable with respect to the fixed body element 301A, it is understood that this is an example. In various implementations, the body element 301A may be moveable with respect to a fixed body element 302A.
Returning to
In response to application of an electrical current, the electrical coil 305B may generate a magnetic field. The magnetic field has a magnetic flux. The magnetic flux may exert a force upon any magnetic material (i.e., the first hard magnet 304B and the second hard magnet 306B) within the magnetic field. The vector of the force may vary with the magnetic flux, which may vary according to the position of the magnetic material within the field. This force may cause the moveable member 301B to move such that the first hard magnet 304B approaches and/or contacts the first magnetic attraction element 303B or the second hard magnet 306B approaches and/or contacts the second magnetic attraction element 308B. Such approaches and/or contacts may result in one or more vibrations or taps which may be provided to a user as haptic output or feedback.
When the first hard magnet 304B contacts the first magnetic attraction element 303B, the first hard magnet may magnetically attach to the first magnetic attraction element. Subsequently, the first hard magnet may remain magnetically attached to the first magnetic attraction element even after the force is no longer exerted upon the moveable member 301B. A similar effect may occur when the second hard magnet 306B contacts the second magnetic attraction element 308B.
The first hard magnet 304B may remain magnetically attached to the first magnetic attraction element 303B even after the first electrical current is no longer applied to the electrical coil 305B. The first hard magnet may remain magnetically attached to the first magnetic attraction element a second electrical current is applied to the electrical coil, resulting in a force being applied to the moveable member 301B (opposite to the force shown in
Returning to
As illustrated, the electrical coil structure 407 may have a first section 409 that is wound in a first direction around the bar structure 406 and a second section 408 that is wound in a second direction around the bar structure. The first direction may be opposite of the second direction. Further, the electrical coil structure may include a middle section 410 where the winding in the first direction changes to the second direction. In various cases, the middle section may be attached to the bar structure, such as utilizing adhesive.
In response to application of an electrical current, the electrical coil structure 407 may generate a magnetic field. The magnetic field has a magnetic flux 414. The magnetic flux may exert a force upon any magnetic material (i.e., the first hard magnet 404 and the second hard magnet 405) within the magnetic field. The vector of the force may vary with the magnetic flux, which may vary according to the position of the magnetic material within the field. This force may cause the moveable bar element 401 to move laterally with respect to the fixed bar element 402. Such movement may result in one or more vibrations which may be provided to a user as haptic output or feedback.
As illustrated, the moveable bar element 401 may be moveably coupled to portions 412 of the fixed bar element 402 via bearings 413. As illustrated in
Although the magnetic circuit 400A is illustrated and described as utilizing the bearings 413 to moveably couple the moveable bar element 401 and the fixed bar element 402, it is understood that this is an example. In other implementations, springs or other moveable attachment mechanisms may be utilized to moveably attach the moveable bar element and the fixed bar element.
Although the moveable bar element 401 has been illustrated and described above as moveable with respect to the fixed bar element 402, it is understood that this is an example. In various implementations, the bar element 402 may be moveable with respect to a fixed bar element 401.
Further contrasted with the magnetic circuit 400A illustrated in
The additional moveable bar element 450 may include a soft magnet 451, a third hard magnet 453, and a fourth hard magnet 452. Additionally, the additional moveable bar element may include a second mass adding element 454. The second mass adding element may be positioned between the third hard magnet and the fourth hard magnet.
Although the magnetic circuit 400D is illustrated and described as utilizing the gear elements 461, 462, and 463 in the same magnetic circuit as the particular electrical coil structure 407, it is understood that this is an example. In other implementations the gear elements 461, 462, and 463 may be utilized to moveably couple various different moveable elements without departing from the scope of the present disclosure. For example, in some implementations the gear elements 461, 462, and 463 may be utilized to moveably couple elements such as the fixed body element 104 and the moveable body element 103 of
The relationship between the dimensions of the cube and the dimensions of the curved areas 471, 473, 474, and/or 476 may determine whether or not the cube bearings 413 move moveable bar element 401 in a purely lateral direction or whether the cube bearings force the moveable body element to translate vertically as well as laterally.
As discussed above and illustrated in the accompanying figures, the present disclosure discloses magnetic actuators and circuits. In various embodiments, a magnetic actuator or circuit may include a moveable element that is moveably coupled to a fixed element via one or more bearings positioned between one or more grooves. In some cases the grooves may be curved. The bearings and the curves may exert a restorative force to return the first and second elements to an original position after movement. In various cases, the bearings may be spherical, cube, cylindrical, and/or include gear elements that interact with one or more gear elements of the grooves.
In some embodiments, a body element may include one or more electrical coils coplanar with a surface of the body element. In various cases, the body element may also include one or more hard magnets positioned in the center of the electrical coil that are polarized to stabilize or destabilize centering of the body element with respect to another element.
In various embodiments, a magnetic circuit may include a bar element with one or more electrical coils wrapped around the bar element. In some cases, the electrical coil may include a first section wrapped in a first direction, a second section wrapped in a second direction opposing the first direction, and a middle section that transitions between the first direction and the second direction.
In one or more embodiments, an actuator may include a fixed element with first and second side soft magnets that is moveably coupled to a moveable element. Exertion of force may cause the moveable element to move such that the moveable body element approaches and/or contacts the first or second soft side magnet. Such contact may result in a “tap,” which may be provided to a user as a tactile output. Upon contact, the moveable element may magnetically attach to the respective soft side magnet and may remain so after the force is no longer exerted until another force is exerted that detaches the moveable element and causes it to move to approach the other soft side magnet.
In other embodiments, an actuator may include a first magnetic attraction element, a second magnetic attraction element, and a moveable member including a first hard magnet, a second hard magnet, and an electrical coil. Exertion of force may cause the moveable member to move such that the first hard magnet approaches and/or contacts the first magnetic attraction element or the second hard magnet approaches and/or contacts the second magnetic attraction element. Upon contact, the respective hard magnet may magnetically attach to the respective magnetic attraction element and may remain so after the force is no longer exerted until another force is exerted that detaches the respective hard magnet and causes the moveable member to move such that the other hard magnet approaches the other magnetic attraction member.
In the present disclosure, the methods disclosed may be implemented as sets of instructions or software readable by a device. Further, it is understood that the specific order or hierarchy of steps in the methods disclosed are examples of sample approaches. In other embodiments, the specific order or hierarchy of steps in the method can be rearranged while remaining within the disclosed subject matter. The accompanying method claims present elements of the various steps in a sample order, and are not necessarily meant to be limited to the specific order or hierarchy presented.
The described disclosure may be provided as a computer program product, or software, that may include a non-transitory machine-readable medium having stored thereon instructions, which may be used to program a computer system (or other electronic devices) to perform a process according to the present disclosure. A non-transitory machine-readable medium includes any mechanism for storing information in a form (e.g., software, processing application) readable by a machine (e.g., a computer). The non-transitory machine-readable medium may take the form of, but is not limited to, a magnetic storage medium (e.g., floppy diskette, video cassette, and so on); optical storage medium (e.g., CD-ROM); magneto-optical storage medium; read only memory (ROM); random access memory (RAM); erasable programmable memory (e.g., EPROM and EEPROM); flash memory; and so on.
It is believed that the present disclosure and many of its attendant advantages will be understood by the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the components without departing from the disclosed subject matter or without sacrificing all of its material advantages. The form described is merely explanatory, and it is the intention of the following claims to encompass and include such changes.
While the present disclosure has been described with reference to various embodiments, it will be understood that these embodiments are illustrative and that the scope of the disclosure is not limited to them. Many variations, modifications, additions, and improvements are possible. More generally, embodiments in accordance with the present disclosure have been described in the context or particular embodiments. Functionality may be separated or combined in blocks differently in various embodiments of the disclosure or described with different terminology. These and other variations, modifications, additions, and improvements may fall within the scope of the disclosure as defined in the claims that follow.
Claims
1. An actuator, comprising:
- a fixed body element including a top structure, at least a first hard magnet and a second hard magnet having a fixed relationship with respect to the top structure, and at least a first side soft magnet and a second side soft magnet having a fixed relationship with respect to the top structure; and
- a moveable body element that is moveably coupled to the fixed body element and includes at least one electrical coil disposed between and spaced apart from the first side soft magnet and the second side soft magnet;
- wherein the moveable body element moves laterally, between the first side soft magnet and the second side soft magnet, in response to a lateral force exerted upon the moveable body element.
2. The actuator of claim 1, wherein the moveable body element magnetically attaches to at least one of the first side soft magnet or the second side soft magnet upon contact.
3. The actuator of claim 1, wherein applying the lateral force moves the moveable body element laterally to approach, contact, and magnetically attach to the first side soft magnet.
4. The actuator of claim 3, wherein the contact of the moveable body element and the first side soft magnet is utilized to produce a tactile output for a user.
5. The actuator of claim 4, wherein the tactile output is a tap.
6. The actuator of claim 3, wherein the moveable body element remains magnetically attached to the first side soft magnet after application of the lateral force.
7. The actuator of claim 6, wherein the moveable body element detaches from the first side soft magnet when at least one opposite lateral force is applied to the moveable body element.
8. The actuator of claim 1, wherein the top structure comprises at least one soft magnet.
9. An electronic device, comprising:
- a haptic output surface;
- an array of hard magnets disposed below the haptic output surface and including a first hard magnet and a second hard magnet;
- a soft magnet structure defining a first side soft magnet and a second side soft magnet, wherein, the first hard magnet and the second hard magnet are disposed between the first side soft magnet and the second side soft magnet; and the first side soft magnet and the second side soft magnet have fixed relationships with respect to the haptic output surface; and
- a movable structure disposed below the array of hard magnets; wherein,
- the movable structure includes an electrical coil; and
- a first current induced in the electrical coil causes the movable structure to move toward the first side soft magnet.
10. The electronic device of claim 9, wherein a second current induced in the electrical coil causes the movable structure to move toward the second side soft magnet.
11. The electronic device of claim 9, wherein:
- the soft magnet structure comprises a top structure parallel to the electrical coil; and
- at least portions of the first side soft magnet and the second side soft magnet extend perpendicularly from the top structure.
12. The electronic device of claim 11, wherein the top structure, the first side soft magnet and the second side soft magnet are portions of a single soft magnet.
13. The electronic device of claim 11, wherein each of the top structure, the first side soft magnet, and the second side soft magnet is a separate soft magnet.
14. The electronic device of claim 9, wherein the movable structure moves laterally between the first side soft magnet and the second side soft magnet.
15. The electronic device of claim 9, wherein the movable structure magnetically attaches to the first side soft magnet upon contacting the first side soft magnet.
16. The electronic device of claim 9, wherein the movable structure remains magnetically attached to the first side soft magnet after the first current is removed and until a second current is induced in the electrical coil.
17. The electronic device of claim 9, further comprising:
- a track pad or touch pad; wherein,
- the track pad or touch pad defines the haptic output surface.
18. The electronic device of claim 9, further comprising:
- a housing for a smart phone or a tablet computing device; wherein,
- the housing defines the haptic output surface.
19. The electronic device of claim 9, wherein the haptic output surface is a surface of a wearable device.
20. The electronic device of claim 9, wherein:
- the movable structure comprises a base;
- the base comprises at least one soft magnet; and
- the electrical coil is attached to the base.
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Type: Grant
Filed: Mar 13, 2019
Date of Patent: May 12, 2020
Patent Publication Number: 20190214895
Assignee: Apple Inc. (Cupertino, CA)
Inventors: Camille Moussette (Los Gatos, CA), John S. Morrell (Los Gatos, CA), Patrick Kessler (San Francisco, CA), Samuel Weiss (Los Altos, CA)
Primary Examiner: Brent Swarthout
Application Number: 16/352,784
International Classification: H02K 33/16 (20060101); G06F 3/01 (20060101); H02K 1/34 (20060101); H02K 7/08 (20060101); H02K 7/108 (20060101);